>> reporter: in the weeks before the event, the shavees ask friends and family to donate money to the cause. >> thank you so much. >> in total, over my three years of shaving, i've raised over $10,000, i believe. >> reporter: that money goes to children's hospitals and scientists working on new treatments. since 2000, st. baldrick's has donated an incredible $60 million. >> my hope is that the money we raise today, who knows, maybe we will fund a doctor and she will find the cure for childhood cancer. >> round of applause for joe, everyone! >> yea! [ applause ] >> wow, feeling good! >> reporter: and st. baldrick's isn't just for men. some very brave girls decided to lose it all for the kids. >> i'm a little bit nervous, because i'm just afraid i'm going to be cold from not having any hair. so that's pretty much my primary concern at this point. >> let's hear it for them! come on, it's a big deal! >> it feels really strange. whoo.